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    • 12. 发明授权
    • Privacy communication device
    • 隐私通信设备
    • US5181246A
    • 1993-01-19
    • US746017
    • 1991-08-12
    • Tsutomu Miki
    • Tsutomu Miki
    • H04K1/00H04Q7/38
    • H04K1/003
    • A privacy communication device uses a control channel (5) in addition to a voice channel (4) in communicating with other privacy communication device. Each privacy communication device employs a ring modulator (8) and a ring democulator (14). A specific modulator carrier frequency to be given to the ring modulator (8) is selected by function of a control signal transmitted on the control channel (5) out of a plurality of modulator carrier frequencies prepared in advance. Likewise, a specific demodulator carrier frequency to be given to the ring democulator (14) is selected by function of a control signal transmitted on the control channel (5) out of a plurality of demodulator carrier frequencies prepared in advance.Hence, when the specific modulator carrier frequency and the specific demodulator carrier frequency are updated at arbitrary intervals, a third person cannot easily identify the varied modulator carrier frequency and demodulator carrier frequency. Thus, secrecy of a voice signal transmitted through the voice channel (4) between the two privacy communication devices is enhanced.
    • 隐私通信设备除了与其他隐私通信设备通信的语音信道(4)之外还使用控制信道(5)。 每个隐私通信设备采用环形调制器(8)和环形解调器(14)。 通过在预先准备的多个调制器载波中在控制信道(5)上发送的控制信号的功能来选择给予环形调制器(8)的特定调制器载波频率。 类似地,通过在预先准备的多个解调器载波频率的控制信道(5)上发送的控制信号的功能来选择给予环形解调器(14)的特定解调器载波频率。 因此,当特定调制器载波频率和特定解调器载波频率以任意间隔更新时,第三人员不能容易地识别变化的调制器载波频率和解调器载波频率。 因此,增强了通过两个隐私通信设备之间的语音信道(4)发送的语音信号的保密性。
    • 18. 发明授权
    • Sine wave generating circuit
    • 正弦波发生电路
    • US5504445A
    • 1996-04-02
    • US894645
    • 1992-06-05
    • Tsutomu Miki
    • Tsutomu Miki
    • H03B28/00H03K4/02H03K3/80
    • H03K4/02
    • There is disclosed a sine wave generating circuit including a counter (11) for counting clocks (CLK) to provide count results (B0 to B4), a control timing generating circuit (12) for converting the count results (B0 to B4) into switching control signals (D0 to D10), a synchronous circuit (13) for adjusting the timing of the switching control signals (D0 to D10) to provide switching control signals (Q0 to Q10), a weighted resistor voltage-dividing circuit (14) for voltage-dividing potentials V.sub.D2 and V.sub.S2 by means of resistors to transmit the divided potentials sequentially to a low pass filter (15) in accordance with the switching control signals (Q0 to Q10) given from the synchronous circuit (13), and the low pass filter (15) formed of a switched capacitor having a transmission zero point which is a frequency (fCLK) of the clock (CLK). Since the resistors are set such that the divided potentials are values for a sine wave, the sine wave has high accuracy and low distortion factor. Since the transmission characteristics of the low pass filter is variable depending on the clock frequency, the sine wave having a variable frequency and good effects of suppressing high-frequency components is achieved.
    • 公开了一种正弦波发生电路,包括用于计数时钟(CLK)以提供计数结果(B0至B4)的计数器(11),用于将计数结果(B0至B4)转换为切换的控制定时发生电路(12) 控制信号(D0〜D10),用于调节切换控制信号(D0〜D10)的定时的同步电路(13),提供切换控制信号(Q0〜Q10),加权电阻分压电路(14),用于 分压电位VD2和VS2通过电阻根据从同步电路(13)给出的开关控制信号(Q0至Q10)顺序地将分压电位传输到低通滤波器(15),低通 滤波器(15)由具有作为时钟(CLK)的频率(fCLK)的传输零点的开关电容器形成。 由于电阻器被设置为使得分压电位是正弦波的值,所以正弦波具有高精度和低失真因子。 由于低通滤波器的传输特性根据时钟频率而变化,所以实现了具有可变频率的正弦波和抑制高频分量的良好效果。